Question

I want the right grey section to be 100% height according to white section, on this website.

Answer 1

You can play with displaying element as table and table cell.
First you need to put the title outside the box (#report-container), and remove the floating property on both div inside #report-container (#text & .right-info), also the width value.
Then add this style :

#report-container{
   display:table;
}
#text , .right-indo { 
   display:table-cell;
   vertical-align :top;
}
.right-info { 
   width : 217px; /* the size of the #text will be the rest */
} 

See my demonstration here.

You can try to resize browser window or add content to the #primary, and the #secondary height will be same.